Information Technology Reference
In-Depth Information
Fig. 6 Calibration phantom containing 3 N-wires. 3D-printing-ready CAD model, instructions,
and calibration software are all available in the Plus toolkit [
3
]
Fig. 7 Ultrasound image of the calibration phantom containing 3 N-wires with an overlay
showing the results of the automatic marker detection algorithm
just require a simple
ecting surface as calibration phantom,
however the method is not very robust and can provide very inaccurate results if the
motion patterns are not completed carefully or not optimal imaging parameters are
used.
The ultrasound imaging system is typically only loosely coupled to the position
tracking system and there can be temporal misalignments between tracking and
imaging data that is recorded at the same time. The goal of temporal calibration is
to detect and compensate such temporal misalignments. Accurate temporal cali-
bration is needed when images are acquired while moving the transducer. High
accuracy and reliability is achievable using hardware triggers. If hardware-based
fl
flat diffusively re
fl
